the good will has long been there, but the government was lacking the means to patrol the area. rangers are trying a new approach together with germany's giz development agency. rather than trying to keep the farmers out, they work with them to find eco-friendly ways of working the land. >> imagine living in the middle of a protected nature reserve. for gilberto jiminez and his two friends, that is reality. the vast sierra madre oriental mountain range in northeastern mexico is their home. on the way to their fields, they passed the stream. it supplies water to the entire village. but over the years, the farmers have observed unsettling changes. >> the climate keeps changing. it is becoming dryer and the water is decreasing. actually, the water in the space and should reach up to here. this one should be this high. when there is a lot of water, it bubbles out on the top and not here at the bottom. >> every year in may, the villagers erect crosses as a sign of gratitude for the water. and as a prayer that the water will stay. their fields lie on the mountain slopes. once, this wa